针对二维复杂结构电磁场计算问题,本文研究了基于三角形单元的时域有限积分方法。将该方法和时域有限差分方法应用于求解半径r=0.085m的理想圆波导对应于TM01模式的截止频率,结果显示时域有限积分方法计算得到的结果与理论值之间的相对误差小于时域有限差分方法计算的结果与理论值之间的相对误差,验证了该方法的优越性。 Aiming at the problem of electromagnetic field calculation of two-dimensional complex structure, this paper studies finite element time-domain integration method based on triangular elements. This method and the FDTD method are applied to the ideal circular waveguide with radius r = 0.085m corresponding to the cut-off frequency of TM01 mode. The results show that the relative error between the calculated result and the theoretical value in the FDTD method is less than The relative error between the calculated result of the finite difference method and the theoretical value verifies the superiority of this method.